Yes, all eyes will surely be in the crypto world come Aug 1. However, the day will just past by. It may impact the price, but what we should look is how the price could recovered. I believed that it will rise after everything has settled down. Casual investors will go back to bitcoin and will invest on it making the price of bitcoin to rise again after Aug 1.
This will definitely have an impact on bitcoin prices, everyone would expect nothing bad to happen with bitcoin. I'm still sure the implementation of segwit2x will have a good impact on bitcoins.